Identification of ions Flashcards
1
Q
A flame test can be used to…
A
identify positive ions.
2
Q
Lithium
A
crimson
3
Q
Sodium
A
yellow
4
Q
Potassium
A
lilac
5
Q
Calcium
A
red
6
Q
Barium
A
green
7
Q
Reaction with…
A
sodium hydroxide can help us to identify some positive ions.
8
Q
What ions can be identified using sodium hydroxide?
A
- aluminium
- magnesium
- calcium
- copper (ll)
- iron (ll)
- iron (lll)
9
Q
Aluminium, magnesium and calcium reacting with sodium hydroxide form…
A
white precipitate.
10
Q
To identify aluminium precipitate…
A
we add an excess of sodium hydroxide and the white precipitate will dissolve.
11
Q
Copper (ll)
A
Form blue precipitate
12
Q
Iron (ll)
A
Form green precipitate
13
Q
Iron (lll)
A
Form brown precipitate.
14
Q
Magnesium in a flame test
A
Has no colour.
15
Q
Carbonate and dilute acid produces
A
carbon dioxide which creates a white precipitate in lime water, turning it cloudy.
